Go to the Java Control Panel, set Java 6 (1.6) as the default to use. Unfortunately at this point, Java 1.7 and LW will not work together.
ie: if you uninstalled Java 1.6 then reinstall it, but set 1.6 as the default to use via the Java Control Panel. Otherwise reinstall Java 1.6, Direct Java 1.6 offline download link with the installer set to Run as Administrator and then set this version as the default to use. This way it enables you to keep both versions on the computer if that's what you wish.